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I have a UX31-E Asus Zenbook running 12.04 until today when I tried 12.10. I've experienced this issue on both versions of ubuntu.

I have tried turning the brightness down manually through the settings manager as well as trying to set it using my function keys. Either way works fine while I'm actively using the computer. After a reboot, my brightness is once again at maximum. Additionally, the dim screen to save battery feature has actually been turning my brightness up. Then when I begin using my computer again after it dims the brightness is at max.

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I have the same problem with Thinkpad X230 on 12.04 –  da4c30ff Oct 26 '12 at 6:15
    
askubuntu.com/questions/151651/… –  user101021 Oct 26 '12 at 8:18
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marked as duplicate by Eric Carvalho, Kevin Bowen, Basharat Sial, txwikinger, coteyr May 22 '13 at 12:45

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2 Answers

try PostInstallerF, it has a option for brightness control "control de brillo".

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The first part of your problem, "After a reboot, my brightness is once again at maximum" has been addressed here. More specifically this solution worked for me.

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